Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability,Advanced Materials Interfaces

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Surface Chemistry of All Inorganic Halide Perovskite Nanocrystals: Passivation Mechanism and Stability
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-03-12 , DOI: 10.1002/admi.201701662
Dandan Yang ₁ , Xiaoming Li ₁ , Haibo Zeng ₁

Affiliation

All inorganic halide perovskite (IHP) nanocrystals (NCs) have emerged as a new class of optoelectronic materials for various applications. Surface ligands as surface passivators are essential components of nucleation and growth processes, photoluminescence quantum yields (PL QY), stability, and photoelectric applications. In this review, the relationship of perovskite structure modified is outlined by surface ligand and some properties on account of the ion structure features. This review specifically focuses on the roles of surface ligands in the construction of IHP NCs with fewer defects, higher PL QY, and better stability. Generally, ligands binding to the surface of IHP NCs can form passivation layer, which are beneficial to not only the improvement of PL QY by filling the Br⁻ or Pb²⁺ vacancy but also the enhancement of stability. The surface passivation mechanisms are attributed to the [Br⋯HN⁺] hydrogen‐bonding, chelation, and dative covalent bond interactions. Furthermore, degradation mechanisms assigned to the hydration, ion migration, and dissociation are discussed. The equilibrium problem of purifying and QY and possible reasons are also addressed, which are believed to be solved in the near future with the help of coordination chemistry and surface engineering. Finally, a brief outlook including challenges and possible development is provided.

中文翻译：

所有无机卤化物钙钛矿纳米晶体的表面化学：钝化机理和稳定性

所有无机卤化物钙钛矿（IHP）纳米晶体（NCs）都已成为一类用于各种应用的新型光电材料。作为表面钝化剂的表面配体是成核和生长过程，光致发光量子产率（PL QY），稳定性和光电应用的重要组成部分。在这篇综述中，改性钙钛矿结构的关系由表面配体和由于离子结构特征而具有的一些特性概述。这篇综述特别关注表面配体在构造具有更少缺陷，更高PL QY和更好稳定性的IHP NC中的作用。一般而言，配体结合IHP NC的表面可形成钝化层，这是有益的，不仅通过填充溴改善PL QY的^-或Pb ²⁺空缺也增强了稳定性。表面钝化机制归因于[BR⋯ħ  Ñ ⁺ ]氢键，螯合，配位和共价键相互作用。此外，讨论了分配给水合，离子迁移和离解的降解机理。还讨论了纯化和QY的平衡问题以及可能的原因，相信在不久的将来借助配位化学和表面工程技术将解决这些问题。最后，提供了一个简短的展望，包括挑战和可能的发展。

更新日期：2018-03-12

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